CODEWITHSUNDEEP
javascalabigdecimal
Mekajiki
Mekajiki

Reputation: 941

Can "java.lang.ArithmeticException: Rounding necessary" is detected before rounding?

java.math.BigDecimal generated by decimal string is sometimes available for setScale(n) but sometimes not. 

scala> BigDecimal("1.00000000").setScale(1)
res0: scala.math.BigDecimal = 1.0

scala> BigDecimal("1.00000001").setScale(1)
java.lang.ArithmeticException: Rounding necessary

I know I can catch the exception on thrown, but is there any way to know if Rounding necessary or not before calling setScale?

Upvotes: 1

Views: 13215

Answers (3)

obourgain
obourgain

Reputation: 9336

You can call BigDecimal.scale, which will return the current scale of the BigDecimal.

Calling setScale will throw an exception if the parameter is less than the current scale.

Upvotes: 1

chengpohi
chengpohi

Reputation: 14217

I think you can set default rounding for setScale, like:

BigDecimal("1.00000001").setScale(1, scala.math.BigDecimal.RoundingMode.HALF_DOWN)

Upvotes: 7

Albritter
Albritter

Reputation: 33

You could do a modulo by 1 [0.1, 0.001] and check if the reminder is greater than 0

Upvotes: 0

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